Failure To Get Refund

I paid for my Vuma account on behalf of my sister on 25 March 2025 and have not yet received my refund after they said that they're having troubles allocating the payment. It's been over a month of me and my sister doing follow ups and still have not received any assistance or update whatsoever. We and to pay the account twice in one month and in April again as well. Have tried multiple times to request refund with SADV but did not get any response.